These maxE Solar Mignon AA NiMH Rechargeable Batteries from Ansmann come in a pack of two and each have a capacity of 800mAh and an output of 1.2V. The batteries, which are ideal for high-drain devices, are already pre-charged and ready to use out of the package. The batteries have up to 1000 recharging cycles, and charging times are less than other conventional batteries with no memory effect. Therefore, the batteries can be charged even if they are only half depleted. The batteries have been tested to have a working range between -68 and +122°F, so these batteries can be used in any environment. Because of low self-discharge, the batteries retain 80% of their charge, even after one year in storage.